diff --git a/src/ClientFactory/ClientFactory.php b/src/ClientFactory/ClientFactory.php
index afae4b7f..2d61af2f 100644
--- a/src/ClientFactory/ClientFactory.php
+++ b/src/ClientFactory/ClientFactory.php
@@ -5,6 +5,7 @@
 namespace Http\HttplugBundle\ClientFactory;
 
 use Http\Client\HttpClient;
+use Psr\Http\Client\ClientInterface;
 
 /**
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
@@ -14,7 +15,7 @@ interface ClientFactory
     /**
      * Input an array of configuration to be able to create a HttpClient.
      *
-     * @return HttpClient
+     * @return HttpClient|ClientInterface
      */
     public function createClient(array $config = []);
 }